3COM 3C888 User Manual
Dual 56K LAN Modem
Getting Started Guide
MODEL NO. 3C888
Part No. 1.024.2153
Congratulations on choosing the 3Com OfﬁceConnect Dual 56K LAN Modem! For the most common network application — creating a local area network (LAN) with shared access to the Internet, the Dual 56K LAN Modem setup is a simple,
Connect the cables
Launch your Web browser
to optimize TCP/IP
to run the ISP Wizard
Dual 56K LAN Modem
3Com LAN Guide
OfficeConnect Dual 56K
LAN Modem Getting Started Guide
OfficeConnect Dual 56K LAN Modem
•Getting Started Guide (PDF)
•User Guide (PDF and HTML)
•LAN Modem Desktop Manager
•Virtual FAX Modem/Fax Software
•Adobe Acrobat Reader
Phone port adapter (not provided for
Network Assistant CD
Contains helpful networking tutorials, troubleshooting tips and product information
Two analog telephone cables
Power supply transformer and
This Getting Started Guide is designed to cover the most common application of the Dual 56K LAN Modem — conﬁguration for shared Internet access on a dynamic IP network. For all other applications, refer to the User Guide, located on the OfﬁceConnect Dual 56K Companion
To set up a LAN for shared access to the Internet, you must have the following:
■An Internet Service Provider (ISP) Account
■A Computer with Ethernet connectivity, TCP/IP software,* and a
■A Web Browser, such as Netscape Navigator (4.0 or later) or Microsoft Internet Explorer (4.0 or later), installed on your computer
*TCP/IP is automatically included with Windows 95, 98, NT, and 2000 and is built in with Mac OS 7.6 or later.
STEP1. INSTALLING THELAN MODEM
To install the Dual 56K LAN Modem:
1 Turn off your computer.
CAUTION: You should only connect one computer to the LAN Modem for the initial setup. After installing and conﬁguring, you can connect additional computers to the unit. Do not connect the Dual 56K LAN Modem to an existing LAN until after you have completed the conﬁguration.
2Connect your computer to LAN port 1, using the supplied Ethernet cable.
3Connect the analog cables to the LINE 1 andLINE 2 ports, and plug the opposite ends into available wall jacks.
You may have to use
If you are only using one line, use the LINE 1 port.
Analog telephone cables
STEP1. INSTALLING THELAN MODEM(CONT’D)
(Optional) Connect up to two other analog
devices, using ports PHONE 1 andPHONE 2.
Connect the power supply to the unit.
Plug the other end into a wall outlet.*
Watch for the LEDs on the front of the
unit to ﬂash. The Power LED remains lit.
* Use of a
7Turn on your computer.
Watch for the LAN Status LED to ﬂash and then remain lit.
This completes the installation. Continue with
“Step 2. Optimizing your computer.” Refer to “Troubleshooting,” page 6 if you experience difﬁculty. To set up additional
workstations, follow steps 1, 2 and 7, using an additional Ethernet cable (not provided)
for each computer you connect to the LAN Modem.
k LAN Mo
STEP2. OPTIMIZING YOUR COMPUTER
Before you can conﬁgure the LAN Modem for Internet access, each computer must be properly set up with TCP/IP and optimized for use with the LAN Modem. Follow the instructions below for your operating system.
If you already know that you will be connecting to a static IP network, the
Chapter 3 of the User Guide instead of running the
Windows 95, 98, 2000 and NT: Run the
Macintosh: Perform this simple check to verify that the settings on your computer or computers are optimized for use with the LAN Modem:
1From the Apple menu, select Control Panels, and thenTCP/IP.
2In the Connect Viaﬁeld, select Ethernet(if iMac, select Ethernet
3Look at the Conﬁgure ﬁeld entry.
If it is set to Using DHCP Server and all other ﬁelds are blank or set to <will be supplied by server>, then you are ready to continue directly with Step 2, “Installing the LAN Modem.”
If Conﬁgure is set to anything other thanUsing DHCP Server (there are speciﬁc values in any of the other ﬁelds), your computer may have a static IP address. Refer to Chapter 3 of theUser Guide to perform additional steps not covered in this
Getting Started Guide.
STEP3. CONFIGURING FORINTERNETACCESS
Before You Start the Conﬁguration, have the following information ready:
■Your analog telephone number or numbers
■ISP telephone number
■ISP account user ID
■ISP account password (including ISP DNS server address if required)
■(Optional) Call Waiting Disable Command (your telephone company can provide this value)
To Conﬁgure for Internet Access:
1Launch the Web browser on the computer that you connected to the LAN Modem.
A welcome message appears. (If it does not, refer to “Troubleshooting,” page 6.)
The Dual 56K LAN Modem clock synchronizes itself to the date and time on your computer. The Set Password window appears.
3(Optional) Enter a password in the Password ﬁeld and in the Password (repeat) ﬁeld to conﬁrm. (Be sure to record this for future use.) A password guards access to the LAN Modem, and is recommended if you will set up
The Set Country and Telephone Numbers window opens.
5Choose your country from the
6Enter your analog telephone number(s) including area code and click Continue.
If you chose any country other than the United States, the LAN Modem resets and then returns you to the initial Welcome screen. Continue from Step 2, above.
The ISP Wizard window appears.
7Enter your ISP information. Choose any name for the ISP Name ﬁeld. If you are not sure about the DNS server address, leave this ﬁeld blank.
8In the Dial Out Preﬁx ﬁeld, enter the number you must dial to reach an outside line from your location, if applicable (for example, “9” for use with a PBX).
9(Optional) In the Call Waiting Disable Command ﬁeld, enter the value provided by your telephone company.
This is used to prevent incoming calls from interfering with data calls.
A call is launched to your ISP, and a message conﬁrming proper conﬁguration appears.
If the call to your ISP does not go through, refer to the troubleshooting section in the User Guide, located on theOfﬁceConnect Dual 56K LAN Modem Companion
This completes the initial setup and will verify your conﬁguration by placing a test call to the LAN Modem
Support page on 3Com’s World Wide Web site.
12Click Register to register your product.
The ISP Wizard sets your LAN Modem conﬁguration parameters to a typical default. If necessary, you can change these settings by returning to the LAN Modem’s conﬁguration pages. To do so, enter http://3com.oc.lanmodemor http://192.168.1.1in your browser.
The connection made as a result of the ISP Wizard will automatically disconnect after seven minutes of inactivity. If you want to manually disconnect the call, access the LAN Modem conﬁguration page and click
You can now connect up to three more computers (and/or printers) to your new LAN. If you wish to add more than four users, see “Connecting More Than Four Users,” page 5. To set up a connection to a Private Network or second
ISP, refer to Chapters 6 and 7, respectively, in the User Guide.
For documentation, ﬁrmware upgrades, and updated information about your LAN Modem, visit the LAN Modem Support page at any time at http://www.3com.com/support/docs/lanmodem/.
After you have ﬁnished conﬁguring your Dual 56K LAN Modem, you can connect an additional Ethernet hub or hubs to the Dual 56K LAN Modem to add up to 25 users. An example of a
To connect an additional hub:
1Insert one end of a
(not included) into any available port on the back of the Dual 56K LAN Modem.
2Insert the opposite end of the cable into one of the
3If you are connecting to an OfﬁceConnect Ethernet Hub 8, set the MDI/MDIX switch to
MDI (that is, pressed in).
4Connect additional workstations to any available port.
If the hub to which you are connecting does not have an MDI/MDIX switch, you will need a
Ethernet Hub 8
Dual 56K LAN Modem
Use the rubber feet for desktop use. The four
Use the Stacking Clip to stack two or more OfﬁceConnect units together securely.
CAUTION: You can stack up to a maximum of four units. Smaller units must be stacked on top of larger units.
To stack two units:
1Place the ﬁrst unit on a ﬂat surface.
2Fit the clip across the top of the unit, as shown.
The longer end of the fastening pieces should point downward.
3Align the fastening pieces over the slots on each side of the unit, and then push the clip down gently to secure it. Ensure that the fastening pieces snap into the slots.
4Rest the second unit on top of the clip, and align it with the front of the bottom unit.
5Press down gently to secure the top unit onto the clip, ensuring that the fastening pieces ﬁt into the slots,
To unstack units, gently pry the top unit away from the clip, and then carefully pull each fastening piece out of its slot to detach the clip from the bottom unit.
The table below lists symptoms of common problems, possible causes, and possible solutions. For additional troubleshooting information, refer to the User Guide located on the3Com Companion Programs
Web browser does not
Web browser needs the IP
Enter the following URL in your Web browser: http://3com.oc.lanmodem. Alter-
start (the welcome
address of the LAN Modem;
natively, you can enter http://192.168.1.1.
message does not
or the browser is not set to a
default start page
Incompatible IP address on
Reset the IP address on your computer, as follows:
Windows 95 and 98: Runwinipcfg.exe. Select the Ethernet adapter connected to the Dual 56K LAN Modem. ClickRelease All and thenRenew All.
Windows NT 4.0/2000: Run ipconfig /releaseand then ipconfig /renew.
Web browser may be configured to use a proxy server.
There is a configuration problem.
At installation, LAN LED
Wrong cable used to connect
does not light up.
your computer to the LAN
Modem’s LAN port.
At installation, ALERT
An internal failure.
LED remains lit.
Macintosh: From Apple menu, selectControl Panels; thenTCP/IP. In the Connect via field, make sureEthernet is selected. In the Configure field, selectUsing Bootp Server to clear the fields. Close and save changes.
Set the browser to use the LAN Modem, as follows:
Internet Explorer: From theView menu, chooseInternet Options. Click theConnection tab. Uncheck the box labeledConnect using Proxy server.
Netscape: From theEdit menu, choosePreferences. UnderAdvanced, chooseProxies. Check the box labeledDirect Connection to the Internet.
Reset the Dual 56K LAN Modem to the factory default setting as follows:
Press and release the reset button located on the back of the unit. The Alert LED will begin to flash. While the LED is still flashing, press and continue to hold in the reset button on the back of the unit. (You must continuously hold the reset button through three cycles of LED flashing: Reset, Firmware Download Mode, and Factory Default Reset.) After the ALERT LED has flashed for the third cycle, you have successfully reset the LAN Modem back to factory defaults. Release the reset button.
The LAN Modem reinitializes itself and is reset to the factory defaults. All
Make sure you are using the
Notify your reseller or technical support that the Dual 56K LAN Modem has failed the
At installation, ALERT LED continues to flash.
No dial tone when handset of a phone attached to unit is lifted.
Cannot place test call to the Internet
Telephone line cables, power cable, and/or phone cables may not be firmly connected.
Telephone line cables may not be in the correct ports.
Data call may be in progress.
ISP not properly configured.
Phone line not connected.
Check all cables and connectors to ensure that they are inserted securely.
Ensure that the incoming analog telephone line cables have been connected to the ports labeled LINE 1 andLINE 2 on the Dual 56K LAN Modem’s back panel. If using a single analog line, connect to Line 1.
Disconnect any data calls currently in progress.
Confirm your ISP connection settings, such as Username, Password, and telephone number. Follow steps
Check all cables and make sure that telephone line is connected to the Line 1 port.
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